Etymology
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flatus (n.)

1660s, "wind in the bowels," from Latin flatus "a blowing," from flare "to blow" (from PIE root *bhle- "to blow").

updated on May 05, 2017

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Definitions of flatus from WordNet

flatus (n.)
a reflex that expels intestinal gas through the anus;
Synonyms: fart / farting / wind / breaking wind
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.